Roofing material.



S. G. WRIGHT.

ROOFING MATERIAL.

APPLICATION FILED APR.4, 1912.

1,075,745- Patented 001.14, 1913.

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Iman/55m' raar aerien@ Smm G. WEIGHT, F OAX PARK, ILLINOIS.

RFING MATERIAL.

Specification of Letters Patent.

Patented (Get. i4, MMS,

Application filed pril 4, 1912. Serial Ho. 68%,56L

To all whom t may Concern:

Be it known that l, STEPHEN G. WRIGHT, a citizen of the United States, residing at Oak Park, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Roofing Material, of which the following is a specification.

My invention relates to improvement 1n prepared-sheet-roong having for its base a sheet of brous material such as felt or paper, saturated and coated with bitumen, coaltar` or other suitable organic or mineral wax andhaving a layer of water-resisting particles forming the weather-surface of the roofing. In the manufacture of material of this character it is desirable that the exposed layers of'wear-resisting particles be provided of different colors 'as desired, andl various 'attempts havebeen made to manufacture, within the limitations of cost which must be observed, roofing-material presenting a desirable shade of green, but such attempts have hitherto been unsuccessful.

My object is to produce .rooting-material having a wear-resisting layer of particles forming its weather-surface which shall pre-- sent a desirable green coloring and which may bemanufactured at relatively low cost. The accompanying drawing illustrates a sheet of rooting material made in accordance with my invention.

ln the manufacture of my improved roofing, I employ a sheet 2 of felt, or other fibrous material, and treat it to a hot bath of bitumen, coal tar or any other suitable organic or mineral wax, as is common practice, to saturate the fibrous sheet, and to produce on the upper surface thereof a coating of the bitumen, or other materials as 40 mentioned as represented at 3. l then spread upon the coating 3, while it ,is still hot., a surfacing of particles 4, and partially embed them` in the coating by applying suitabler pressure as by passing the sheets between rollers.

ln carrying out my invention lt use for the surfacing 4 particles of any rock of the diorite-gabbro series, commonly known among miners and prospectors as greenstone, reduced, as by crushing, to preferably about 10 to 30 mesh, though the size of the particles 4 may vary, according to desire, from that stated. rlhese particles 4 thus become embedded in the coating 3 and are suciently close together to cause the exposed surface of the roofing to present the color of the particles 4 as a substantially unbroken surface as to color. Greenstone, in its natural condition, is of a grayishgreen color, a color not desirable for rooting m surfaces, but l have discovered that by applying a fluid thereto, of a character substantially insoluble in water which becomes absorbed by said stone, the color of the latter is changed from one not desirable for roong purposes, to a substantially permanent shade of green which is highly suitable for roof ornamentation.

Any desirable fluid which will resist dissolving when subjected to rain or snow may. l@

be used for this purpose and it may be brought into contact with the particles 4, for absorption thereby, in any desirable way, as for example,A oil or any of the various mineral waxes or vegetable gums dissolvedl 7E in any light oil such vas naphtha or in any other solvent may be used, or in fact any fluid possessing the properties above stated may be employed. lt is preferred, however,` that the Huid used be any desirable vegetable, animal or mineral oil, as for example, a minerai oil of a specic gravity of about 33 Baume.

ln carrying out my invention the materia r forming the particles 4 either before or after 85 crushing and before application to the coating 3, may be treated to the said fluid in any desirable manner, or the particles 4 may be treated tothe said duid at a later stage inthe process of manufacture. lhus the par- 90 ticles 4, spread on the coating 3,'may be passed between rollers (not shown) covered by cloth, or other suitableQabsorbent material, saturated with said Huid for application to the particles 4, or said Huid may be applied to the particles 4 in any other desirable manner. lf desired, said duid for application to the particles 4, especially where said duid be an oil, may be brought into Contact therewith, forV absorption there- 100. by, by providing inthe water-proof coating 3 for the base 2, during the manufacture of the material for said coating, or after the coating 3 has been applied to'the base 2, a sulicient amount of oil of any desirable kind to-,produce the -desired absorption thereof by the particles 4 for rendering them of the desired shade of color. 'When the absorption by the particles 4 with oil is to *be edected through contact of these particles with the u@ coating 3, care should he observed to insure the provision of the requisite amount of oil in the coating in order that the particles 4 take up sufficient oil to produce the desired shade of color in said particles; and should some of the coatingr materials as now commonly used inherently containin the desired amount of oil for producing the change of color desired in the particles of greenstone (a condition Which is considered det-v rimental to roolings as hitherto manufactured) the addition of oil to such coatingmaterial Will be rendered unnecessary. The application of said fluid to the particles 4 not only causes the roofing to present the desired shadeof green, but the color produced is rendered substantially permanent and unchanging. It Will be understood that, if desired, the coating 3 and particles 4 may be applied to both sides of the base 2.

What I claim as new and desire to secure by Letters Patent is: Y

1. Rooing composed of sheet Water-proof material having its Weather-surface composed of particles of greenstone, with oil, for the purpose set forth.

2. Roofing composed of sheet material coated with Water-proofing material of the character described and a surface of particles of greenstone, with oil, partially embedded in said coating,`for the purpose set forth.

STEPHEN G. WRGHT. In the presence of E. D. SFEELE, R. A. SCHAEFER. 

